So the hatch was a 100% failure, boo. :( We are going to try again, after conferring with other chicken people. The incubator will be outfitted with a new electronic thermostat and a forced-air fan unit, and relocated back in the kitchen. I find it hard to believe that moving the thing about 8 feet would make such a total difference, but...well...we DID get some chicks hatch last year when we did that!
Still time to hatch chicks for the kids' Science Fair project, so all is good, still.